Tait TM8000 Series Service Manual

Also see for TM8000 Series: Service manual Service manual Installation instructions Operation and service manual Accessories manual

Tait TM8000 Series Service Manual Manual pdf 23 page image

TM8100 Mobile Radio Service Manual Introduction 23May 2004 © Tait Electronics Limited1.3 Control HeadIntroduction The control head clips securely to the front of the radio body. Thecontrol-head loom between the two is enclosed in the space betweenthem. For badging and branding purposes there are both a logo and alabel for the product model code on the front panel. The control headmay also be left unbadged. For the control heads with UI, the essentialfeatures are shown in the block diagram of Figure 1.6.Control Heads with UI The front panel of the control heads with UI is fitted with the controlsand indicators needed by the radio user; these comprise:■ LCD (liquid-crystal display) screen■ indicator LEDs (light-emitting diodes)■ volume control■ ON /OFF key■ function keys■ channel-selection keysIn addition, there are the microphone connector and an internal speaker.The necessary circuitry for the above items is mounted on a control-headboard fitted behind the front panel. The volume-control potentiometeris fixed to the board; so is a control-head connector, which is used forthe control-head loom between the control head and radio body.Options for ControlHeads with UI The control heads with UI allow for an optional concealed microphoneor the use of a dynamic microphone. (A concealed microphone is fittedbehind the front panel next to the speaker.) With either option a separatecircuit board is required for the microphone. This board is connected tothe control-head board by means of two connectors; the plugs of theconnectors are mounted on the latter board and the sockets on theformer. Full details of the optional microphones and circuit board aregiven in the accessories manual.Blank Control Head The blank control head has none of the features of the control heads withUI. The front panel of the blank control head is fitted only with thesingle programming connector. The control-head loom is permanentlyfixed to the rear of the programming connector. The space inside thecontrol head can be used for the fitting of an optional third-party circuitboard, but is otherwise empty.